#include<iostream>
using namespace std;

class person
{
public:
	void personage()const
	{
		m_a = 100;
	}
	mutable int m_a;
};


void test01()
{
	person p;
	p.personage();
}

void test02()
{
	const person p;
	p.m_a = 20;
}
int main()
{
	test01();
	test02();
	system("pause");
	return 0;
}